测量了高Ｔｃ超导体系Ｂｉ－Ｓｂ－Ｓｒ－Ｃａ－Ｃｕ－Ｏ的红外吸收光谱，其结果表明：只有在（４００ｃｍ－１－７００ｃｍ－１）的范围内，存在一组随超导相不同而变化的峰群，根据群论分析和ＣｕＯ的红外吸收光谱，认定它们分别对应于［ＣｕＯ６］八面体、［ＣｕＯ５］金字塔和［ＣｕＯ４］平面四边形结构，而不是ＣｕＯ面或ＣｕＯ链．进一步分析可得结论，由［ＣｕＯ５］金字塔组成的准三维ＣｕＯ面和它们之间的适当偶合才是获得高Ｔｃ的关键，而且似乎偶合越弱，Ｔｃ越高． The infrared absorption spectrum of Bi-Sb-Sr-Ca-Cu-O with high Tc superconducting system was measured. The results show that there are only one group in the range of (400cm-1-700cm-1) Based on the group theory and the infrared absorption spectra of CuO, the peak groups were found to correspond to [CuO6] octahedron, [CuO5] pyramid and [CuO4] planar tetragonal structure, respectively, rather than CuO surface or CuO chains. Further analysis leads to the conclusion that the quasi-three-dimensional CuO surface consisting of the [CuO5] pyramid and the proper coupling between them are the key to achieving high Tc, and it appears that the weaker the coupling, the higher the Tc.